The portion of a child's meal, Halloween candy, video game time, etc. that a father rightly takes as his own, mostly because you wouldn't be there without him. This particularly applies to things that your father buys for you - because there's no such thing as a free lunch, and life is hard, so you better get used to it.

My kids came home from their Halloween trick-or-treating, and as they sorted through the candy, I took all of their Reese's Peanut Butter cups as daddy tax.